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People often associate swollen feet with pregnancy, injury, or a job that requires standing for long hours. However, not all cases of swollen feet are due to these reasons.
There can be many other causes of swollen feet. Most of the time, swelling is not serious and can be resolved by simply resting the feet or soaking them in ice water.
However, if you experience sudden swelling in your feet, it may indicate an underlying issue and it is important to seek medical attention.
Causes of swollen feet
Deep vein thrombosis

A condition known as deep vein thrombosis (DVT) occurs when a blood clot forms in the deep veins of your body, usually in the legs, according to the Mayo Clinic. You may experience swelling and heaviness in your legs, as well as clearer veins in your legs. However, some people may not have any symptoms. DVT is dangerous as it can cause a blockage of blood flow to the lungs, which is called pulmonary embolism.
Achilles Tendonitis

The Achilles tendon is the strongest tendon in the body and it is used a lot every day. This can cause pain and difficulty moving. When someone has Achilles tendonitis, their ankles, and heels might become swollen, especially after exercising or doing other physical activities.
Osteoarthritis

Arthritis is a common problem, but osteoarthritis is the most common type. When it affects your feet, it can make them hurt, feel sore, stiff, and become swollen. To feel better, there are ways to ease the pain, such as doing yoga.
Heart Failure

The American Heart Association says that heart failure can show in subtle ways, one of which is having swollen feet. This happens because the heart is not working properly and fluid builds up, called edema, causing the legs, feet, or ankles to swell.
Lymphedema

The Mayo Clinic explains that lymphedema makes the extra lymphatic fluid build up in your arm or leg, making it swollen. If the swelling happens quickly or hurts a lot, you should go to a doctor or a hospital right away.
